US6910841B2 - Thread-forming screw - Google Patents

Thread-forming screw Download PDF

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Publication number
US6910841B2
US6910841B2 US10/113,950 US11395002A US6910841B2 US 6910841 B2 US6910841 B2 US 6910841B2 US 11395002 A US11395002 A US 11395002A US 6910841 B2 US6910841 B2 US 6910841B2
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US
United States
Prior art keywords
thread
bore
workpiece
forming
shank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10/113,950
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English (en)
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US20020146300A1 (en
Inventor
Rainer Isenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITW Automotive Products GmbH
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ITW Automotive Products GmbH
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Filing date
Publication date
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Assigned to ITW AUTOMOTIVE PRODUCTS GMBH & CO. KG reassignment ITW AUTOMOTIVE PRODUCTS GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISENBERG, RAINER
Publication of US20020146300A1 publication Critical patent/US20020146300A1/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic

Definitions

  • the invention refers to a thread-forming screw.
  • Thread-forming screws typically are screws having a thread adapted to produce a counter or female thread in a bore of a workpiece.
  • a tapping thread a counter thread is produced in a preformed hole by a chip-generating forming process.
  • the counter thread is generated substantially without chips through a plastic deformation of the workpiece.
  • the preformed hole or the preformed bore normally has not the core or root diameter of the thread-forming screw, rather, is provided with a greater diameter, preferably with the thread pitch diameter of the thread-forming screw.
  • the thread-forming screw normally is provided with a first cut or a conical portion by which a centering in the bore is achieved and an easy moving of the threads of a thread-forming portion into the wall of the bore, as well.
  • Threaded connections with thread-forming screws suffer under undesired release, for example by vibrations.
  • such thread-forming screws are pre-assembled with corresponding workpieces, e.g. of synthetic material.
  • the thread-forming screw is partially turned into the bore of the workpiece.
  • vibration may occur which may lead to a loosening of the screws from the workpieces.
  • the micro capsules effect an increased friction and thus may avoid an undesired loosening of the screw in the bore.
  • the application of such micro capsules is relatively expensive.
  • a thread-forming screw is to be provided which in the pre-assembled and also in the finally assembled state guarantees a maximum safety against undesired release.
  • the shaft at the end opposite to the head has a spherical portion with a maximum diameter in a plane perpendicular to the axis of the shank which is approximate to the pitch thread diameter of the thread on the shank.
  • the shape of the spherical portion may be different. Essential is that the portion which comes into contact with the wall of the bore is spherical.
  • the spherical portion may be a section of a ball.
  • the diameter of the ball section adjacent to the thread-forming zone has the same diameter as the thread-forming zone at this location.
  • the whole spherical portion adjacent to the thread-forming zone may be formed as ball portion.
  • the diameter of the bore is approximately equal to the pitch diameter of the thread portion.
  • the spherical portion serves for the centering of the screw shank. Sub-sequently, the thread-forming portion forms a thread into the wall of the bore. In case the maximum diameter of the spherical portion is approximately equal to the diameter of the bore, the spherical portion encounters no considerable resistance during the forming of the thread. Independent from the depth the shank is turned into the bore, the thread-forming screw at any time is sufficiently secured against release. The safety in turning-in direction takes place through the bore portion not yet provided with a thread. The safety in the opposite direction is taken over by the spheri-cal portion. If it is made an attempt to withdraw the thread-forming screw from the bore, this can take place only if the already formed thread is destroyed. This can be only done by applying a considerable force which normally is not generated by vibrations.
  • the manufacture of a screw according to the invention can take place similar to that for conventional screws.
  • First a blank without thread is produced in a screw press, i.e. with a spherical or ball-shaped extension. Thereafter, a thread is rolled and the spherical portion is rolled into the desired shape.
  • the rolling of the spherical or ball-shaped portion can take place contemporarily with the rolling of the thread in case a specific rolling tool is available.
  • FIG. 1 shows a thread-forming screw according to the invention outside a workpiece
  • FIG. 2 shows a thread-forming screw of FIG. 1 partially threaded into a workpiece
  • FIG. 3 shows a thread-forming screw according to the invention completely threaded into a workpiece
  • FIGS. 4 a to d show the manufacture of a screw blank.
  • a thread-forming screw 10 is depicted. It includes a head 12 with a hexagon 14 and a flange 16 adjacent thereto. The screw 10 includes further a shank 18 provided with a thread. In the end portion of thread 20 a thread-forming zone is provided having a conical portion 22 . A spherical portion 24 joins to conical portion 22 . The diameter of the spherical portion 24 immediately adjacent the conical portion 22 corresponds to the diameter of the conical portion at this location. The maximum diameter of the spherical portion shown at 26 corresponds to the pitch thread diameter of thread 20 .
  • FIGS. 1 to 3 there is shown a workpiece 28 of plastic material. It includes a throughbore 30 having a diameter which corresponds to the pitch diameter of thread 20 .
  • the thread-forming screw is partially threaded into bore 30 .
  • a thread is formed in the wall of bore 30 , i.e. a so-called internal or female screw thread.
  • the geometry of bore 30 changes.
  • portion 24 can substantially freely pass bore 30 . If upon vibrations a retraction force is exerted onto screw 10 by a back-turning of the screw, this is prevented by the ball-shaped portion 24 . In this case, the ball-shaped portion 24 would be pressed against the already formed thread and deform or destroy it. For this, a considerable force is necessary.
  • the screw head 12 clamps a plate 32 against work-piece 28 through its flange 16 .
  • the ball-shaped portion 24 protrudes out of bore 30 , i.e. through its complete extension in axial direction.
  • the chamfer start 22 terminates at the lower surface of the, workpiece 28 .
  • FIGS. 4 a to 4 d a partial manufacture of screw 10 is illustrated.
  • a rod-like blank 40 is pressed and rolled to a pre-form 42 having a head 44 and a shank with a first shank portion 46 and a second shank portion 48 having a reduced diameter.
  • head 44 is formed to head 44 c which has a flange 50 and countersunk wrench surfaces as shown in FIG. 4 d .
  • shank portion 46 is formed to shank portion 46 d and shank portion 48 is formed to a ball-shaped extension 54 with a narrowed portion 56 of smaller diameter being formed between shank portion 46 d and ball-shaped portion 54 .
  • the thread-forming screw is produced as shown in FIGS. 1 to 3 . It can be seen that in FIG. 4 d the head of the screw differs from that of the screw of FIGS. 1 to 3 . In view of shank 18 and the ball-shaped portion, there is conformity with the screw of FIGS. 1 to 3 .
  • the maximum diameter 26 of portion 24 is greater than the minimum diameter of thread 20 and smaller than the maximum diameter of thread 20 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forging (AREA)
  • Ropes Or Cables (AREA)
  • Transmission Devices (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Surgical Instruments (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US10/113,950 2001-04-06 2002-04-02 Thread-forming screw Expired - Fee Related US6910841B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10117171A DE10117171B4 (de) 2001-04-06 2001-04-06 Anordnung aus einem Werkstück und einer gewindefurchenden Schraube
DE10117171.4 2001-04-06

Publications (2)

Publication Number Publication Date
US20020146300A1 US20020146300A1 (en) 2002-10-10
US6910841B2 true US6910841B2 (en) 2005-06-28

Family

ID=7680620

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/113,950 Expired - Fee Related US6910841B2 (en) 2001-04-06 2002-04-02 Thread-forming screw

Country Status (6)

Country Link
US (1) US6910841B2 (es)
EP (1) EP1248003B1 (es)
CA (1) CA2380250C (es)
DE (2) DE10117171B4 (es)
ES (1) ES2247214T3 (es)
MX (1) MXPA02003526A (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004113736A2 (en) * 2003-06-17 2004-12-29 Newfrey Llc Tamper-resistant threaded fastener
US20060152829A1 (en) * 2003-03-20 2006-07-13 Joerg Stierle Device for adjusting an optical mirror
US20070053763A1 (en) * 2005-09-02 2007-03-08 Jan Allaart Fastening element for hard constructional components
US20080038086A1 (en) * 2006-07-11 2008-02-14 Mnp Corporation Threaded fastener with retainer
US20080159826A1 (en) * 2006-07-11 2008-07-03 Mnp Corporation Threaded fastener with retainer and method of making such fastener
US20090053008A1 (en) * 2005-05-31 2009-02-26 Topura Co., Ltd. Tapping screw
US20090208307A1 (en) * 2008-02-18 2009-08-20 Guyton Jason D Releasable Fastener Systems and Methods
US20100040432A1 (en) * 2006-12-27 2010-02-18 Katsuyuki Totsu Screw
US11174888B2 (en) * 2017-07-10 2021-11-16 Mr Industrial Fasteners S.R.L. Threaded pin

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060093456A1 (en) * 2004-11-04 2006-05-04 Delcourt Mark H Positive hold weld stud
US20130001891A1 (en) * 2011-06-29 2013-01-03 Caterpillar Inc. Sealing assembly
DE102014203276A1 (de) * 2014-02-24 2015-08-27 Bayerische Motoren Werke Aktiengesellschaft Mit fließlochformender Schraube gefügter Bauteilverbund und Verfahren zum Herstellen einer Fügeverbindung, sowie fließlochformende Schraube mit Hülse

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856617A (en) 1956-04-17 1958-10-21 Nat Machine Products Company Method of making self-locking valve lash adjusting screws
US3094894A (en) * 1961-02-28 1963-06-25 Elco Tool And Screw Corp Piercing and tapping screw with groove to facilitate tapping
US4261402A (en) 1978-11-06 1981-04-14 Textron, Inc. Captive thread forming terminal screw
US4637767A (en) * 1980-12-26 1987-01-20 Topura Co., Ltd. Threaded fastener
JPH01182613A (ja) * 1988-01-16 1989-07-20 Toopura:Kk パイロット付ねじ
DE3922684A1 (de) 1989-03-23 1991-01-24 Jaeger Eberhard Gmbh Loch- und gewindeformende schraube
US5209622A (en) * 1991-11-29 1993-05-11 K.K. Aoyama Seisakusho Bolt having spherically tipped thread free cylindrical column
WO1998013606A1 (en) 1996-09-24 1998-04-02 Textron Inc. Fastener member with anti-cross-threading point and method of assembly
US6135892A (en) * 1998-11-24 2000-10-24 Textron Inc. Method of forming a short point anti-cross threading member
US6142186A (en) 1997-01-17 2000-11-07 Textron Inc. Thread-forming pipe plug
US6155761A (en) * 1998-11-24 2000-12-05 Textron Inc. Short point anti-cross-threading design
US6158938A (en) 1998-03-11 2000-12-12 Illinois Tool Works Inc Anti-cross threading fastener

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US4283424A (en) * 1979-08-06 1981-08-11 The Quaker Oats Company Frozen pizza crust and pizza suitable for microwave cooking
IL60685A (en) * 1980-07-28 1982-04-30 Univ Ben Gurion Mix for the preparation of bread and cake products
US4381315A (en) * 1981-05-11 1983-04-26 The Pillsbury Company Refrigerated dough and method of manufacture
US4847104A (en) * 1981-12-02 1989-07-11 General Foods Corporation Frozen dough having improved frozen storage shelf life
US4957750A (en) * 1989-05-05 1990-09-18 Kraft General Foods Microwaveable baked goods
US5554404A (en) * 1994-11-22 1996-09-10 Rhone-Poulenc Inc. Leavening acid composition
US5855945A (en) * 1996-09-30 1999-01-05 The Pillsbury Corporation Method of preparing dough
US6080441A (en) * 1998-05-08 2000-06-27 Rhodia Inc. Leavening acid composition
US6261613B1 (en) * 2000-02-15 2001-07-17 General Mills, Inc. Refrigerated and shelf-stable bakery dough products
AU2001241843A1 (en) * 2000-03-10 2001-09-24 General Mills Marketing, Inc. Scoopable dough and products resulting therefrom
US20020172747A1 (en) * 2001-04-02 2002-11-21 Rhodia Inc. Self rising dough-containing food product

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856617A (en) 1956-04-17 1958-10-21 Nat Machine Products Company Method of making self-locking valve lash adjusting screws
US3094894A (en) * 1961-02-28 1963-06-25 Elco Tool And Screw Corp Piercing and tapping screw with groove to facilitate tapping
US4261402A (en) 1978-11-06 1981-04-14 Textron, Inc. Captive thread forming terminal screw
US4637767A (en) * 1980-12-26 1987-01-20 Topura Co., Ltd. Threaded fastener
JPH01182613A (ja) * 1988-01-16 1989-07-20 Toopura:Kk パイロット付ねじ
US5234301A (en) * 1989-03-23 1993-08-10 Ejot Eberhard Jaeger Gmbh & Co. Hole forming and selftapping screw
DE3922684A1 (de) 1989-03-23 1991-01-24 Jaeger Eberhard Gmbh Loch- und gewindeformende schraube
US5209622A (en) * 1991-11-29 1993-05-11 K.K. Aoyama Seisakusho Bolt having spherically tipped thread free cylindrical column
WO1998013606A1 (en) 1996-09-24 1998-04-02 Textron Inc. Fastener member with anti-cross-threading point and method of assembly
US6328515B1 (en) * 1996-09-24 2001-12-11 Textron Inc. Fastener with anti-cross-threading point and method of assembly
US6142186A (en) 1997-01-17 2000-11-07 Textron Inc. Thread-forming pipe plug
US6158938A (en) 1998-03-11 2000-12-12 Illinois Tool Works Inc Anti-cross threading fastener
US6135892A (en) * 1998-11-24 2000-10-24 Textron Inc. Method of forming a short point anti-cross threading member
US6155761A (en) * 1998-11-24 2000-12-05 Textron Inc. Short point anti-cross-threading design

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Title
DIN 7500, Oct. 1978, pp. 1-6.
Patent Abstract of Japanese Publication No. 03272309 A, Published Dec. 4, 1991.

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060152829A1 (en) * 2003-03-20 2006-07-13 Joerg Stierle Device for adjusting an optical mirror
WO2004113736A3 (en) * 2003-06-17 2007-01-18 Newfrey Llc Tamper-resistant threaded fastener
WO2004113736A2 (en) * 2003-06-17 2004-12-29 Newfrey Llc Tamper-resistant threaded fastener
US20090053008A1 (en) * 2005-05-31 2009-02-26 Topura Co., Ltd. Tapping screw
US7780388B2 (en) * 2005-05-31 2010-08-24 Topura Co., Ltd. Tapping screw
US20070053763A1 (en) * 2005-09-02 2007-03-08 Jan Allaart Fastening element for hard constructional components
US8708631B2 (en) * 2005-09-02 2014-04-29 Hilti Aktiengesellschat Fastening element for hard constructional components
US7950887B2 (en) 2006-07-11 2011-05-31 Mnp Corporation Threaded fastener with retainer and method of making such fastener
US20090290954A1 (en) * 2006-07-11 2009-11-26 Dietz Michael G Threaded Fastener with Retainer and Method of Making Such Fastener
US7465137B2 (en) * 2006-07-11 2008-12-16 Mnp Corporation Threaded fastener with retainer
US20080159826A1 (en) * 2006-07-11 2008-07-03 Mnp Corporation Threaded fastener with retainer and method of making such fastener
US20080038086A1 (en) * 2006-07-11 2008-02-14 Mnp Corporation Threaded fastener with retainer
US20100040432A1 (en) * 2006-12-27 2010-02-18 Katsuyuki Totsu Screw
US8083453B2 (en) * 2006-12-27 2011-12-27 Katsuyuki Totsu Screw
US20090208307A1 (en) * 2008-02-18 2009-08-20 Guyton Jason D Releasable Fastener Systems and Methods
US8221043B2 (en) * 2008-02-18 2012-07-17 Lockheed Martin Corporation Releasable fastener systems and methods
US11174888B2 (en) * 2017-07-10 2021-11-16 Mr Industrial Fasteners S.R.L. Threaded pin

Also Published As

Publication number Publication date
DE50204143D1 (de) 2005-10-13
EP1248003A3 (de) 2002-11-06
MXPA02003526A (es) 2004-07-16
EP1248003A2 (de) 2002-10-09
DE10117171A1 (de) 2002-11-07
CA2380250A1 (en) 2002-10-06
CA2380250C (en) 2008-01-22
DE10117171B4 (de) 2006-03-30
ES2247214T3 (es) 2006-03-01
EP1248003B1 (de) 2005-09-07
US20020146300A1 (en) 2002-10-10

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Owner name: ITW AUTOMOTIVE PRODUCTS GMBH & CO. KG, GERMANY

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STCH Information on status: patent discontinuation

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Effective date: 20170628